Michelangelo may suffered from osteoarthritis in his left hands. Or, maybe, holding his chisel in his left hand he hit it too many times with a hammer causing nerve damage. Watch 2 minute video

Interesting, both my hands look the same as M. Its, not the same view, but there many folds between my thumb and the next finger. I have muscle wasting in my left hand due to serious nerve damage. I also have arthritis. Too me, Michelangelo's left hand damage is due to his hammer hitting his hand holding his chisel..

3-29-19 Drawn while I was waiting for cataract surgery on my Left eye I was curious as to how well I could draw with only my right eye. At the time I could only see the big E with the Left eye on the eye chart.

Leonardo da Vinci also had a claw right hand.

In his final years it is said Leonardo stopped painting with his right hand because of it This also could be due to nerve damage. They used alot of toxic paints back then. White was made from lead. Leonardo, liked working in the paints with his fingers. His fingerprints have been found on his paintings. Leonardo also had a stroke around 1517. His stroke could have cause his claw right hand. However, this is unlikely because a storoke would have caused " more widespread paralysis and cognitive issues, which he didn't show." A fall could also have been responsib. Leonardo, gave up painting with his right hand, but he could still draw with his left.